package com.etonenet.util;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;

public class SpringUtil implements ApplicationContextAware {

	// Spring应用上下文环境
	private static ApplicationContext applicationContext;

	/**
	 * 实现ApplicationContextAware接口的回调方法，设置上下文环境
	 * 
	 * @param applicationContext
	 */
	public void setApplicationContext(ApplicationContext applicationContext) {
		SpringUtil.applicationContext = applicationContext;
	}

	/**
	 * @return ApplicationContext
	 */
	public static ApplicationContext getApplicationContext() {
		return applicationContext;
	}

	/**
	 * 获取对象 这里重写了bean方法，起主要作用
	 * 
	 * @param name
	 * @return Object 一个以所给名字注册的bean的实例
	 * @throws BeansException
	 */
	public static Object getBean(String name) throws BeansException {
		return applicationContext.getBean(name);
	}

	public static Object getUser() {
		return (UserDetails) SecurityContextHolder.getContext().getAuthentication().getPrincipal();
	}
}
